Cosmetic brush



FIG. 1 is a front elevational view of a cosmetic brush showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is a front view of the handle with the hair removed;

FIG. 9 is a perspective view of handle with hair removed; and,

FIG. 10 is a top view of the handle with the hair removed.

The broken lines in the drawings depict portions of the cosmetic brush that form no part of the claimed design. 

CLAIM The ornamental design for a cosmetic brush, as shown and described. 